100745 has 4 divisors (see below), whose sum is σ = 120900. Its totient is φ = 80592.

The previous prime is 100741. The next prime is 100747. The reversal of 100745 is 547001.

It is a happy number.

100745 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41209 + 59536 = 203^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 100745 - 2² = 100741 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10070 + ... + 10079.

It is an arithmetic number, because the mean of its divisors is an integer number (30225).

2¹⁰⁰⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

100745 is a deficient number, since it is larger than the sum of its proper divisors (20155).

100745 is an equidigital number, since it uses as much as digits as its factorization.

100745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20154.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 100745 is about 317.4035286508. The cubic root of 100745 is about 46.5308693935.

Adding to 100745 its reverse (547001), we get a palindrome (647746).

The spelling of 100745 in words is "one hundred thousand, seven hundred forty-five".